The average intensity equation of the Sine hyperbolic Gaussian vortex beam (ShGvB) in oceanic turbulence is derived using the extended Huygens-Fresnel integral. The vortex beam will unavoidably widen as it moves through the turbulence of the ocean, eventually reaching a beam size that differs from the source plane. The adaptive optics technique can be employed in underwater optical wireless communication to correct wavefront distortions caused by oceanic turbulence. The average intensity, average transmittance, beam spread and BER is quantified with and without adaptive optics. The results show that the ShGvB propagation through underwater turbulence can be improved by incorporating adaptive optics correction with improved BER.
The propagation dynamics of aluminium-copper colliding laser produced plasma plumes are studied by using time-gated fast imaging and optical emission spectroscopic techniques. The experiment is performed at 10-2 mbar of air ambient. Angular target geometry is employed for the efficient collision of two different laser produced plasmas. When two plasmas collide, it can either stagnate at the collision front or can interpenetrate each other. The dense layer of plasma stagnates at the interaction region called the stagnation layer. Multi species stagnation region is formed at the collision front of heterogeneous colliding laser produced plasma and its time-resolved expansion dynamics are analyzed. The emission intensities are different for the two materials. For a particular laser wavelength, the two metal targets have different thermal and optical properties and thereby different ablation rates. Al with less ablation threshold has more intense emission compare to that of Cu. Plasma parameters like electron density and electron temperature are also measured from the optical emission spectroscopic data.
We report the position dependent tuning of fluorescence emission from Rhodamine 6G doped plastic waveguide using side illumination technique . The transmitted fluorescence as a function of the distance from the point of illumination is measured by translating the waveguide horizontally across a monochromatic light source. This technique has proved to be a useful method for characterizing the light propagation properties of dye-doped waveguides. An important finding of the present studies is the nonlinear behavior of the loss coefficient as a function of propagation distance through the waveguide. It is also found that this type of nonlinear nature depends on the dye concentration and thickness of the waveguide.
A sensitive method based on the principle of photothermal lensing technique to realize optical logic gates is presented. A dual beam thermal lens method using low power cw lasers can be very effectively used as an alternate technique to perform the logical function such as XOR and NAND.
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